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Yocto Build U-Boot from source code

Introduction

This guide walks through the process for manually building and installing the U-Boot images from source. It is derived from TI's Build U-Boot guide

Fetch source code and install dependencies

This section describes the one time process to install the toolchains and fetch the necessary source code for building U-Boot.

Install Toolchains to home directory

$ cd ~
$ wget https://developer.arm.com/-/media/Files/downloads/gnu-a/9.2-2019.12/binrel/gcc-arm-9.2-2019.12-x86_64-arm-none-linux-gnueabihf.tar.xz && \
   tar -Jxvf gcc-arm-9.2-2019.12-x86_64-arm-none-linux-gnueabihf.tar.xz -C $HOME && \
   wget https://developer.arm.com/-/media/Files/downloads/gnu-a/9.2-2019.12/binrel/gcc-arm-9.2-2019.12-x86_64-aarch64-none-linux-gnu.tar.xz && \
   tar -Jxvf gcc-arm-9.2-2019.12-x86_64-aarch64-none-linux-gnu.tar.xz -C $HOME

Fetch Source Code

Setup a working directory

$ export WORKDIR=~/am62x-var-som-u-boot
$ mkdir ~/am62x-var-som-u-boot

Fetch the U-Boot source:

$ cd $WORKDIR
$ git clone https://github.com/varigit/ti-u-boot -b ti-u-boot-2021.01_var01 ti-u-boot

Fetch the core-secdev-k3 Security Dev Tool:

$ cd $WORKDIR
$ git clone https://git.ti.com/git/security-development-tools/core-secdev-k3 -b master core-secdev-k3
$ cd core-secdev-k3 && \
  git checkout bba9cabaeee96f7f287385188ff289b46769a4bf && \
  cd ../

Fetch ti-k3-image-gen:

$ cd $WORKDIR
$ git clone https://git.ti.com/git/k3-image-gen/k3-image-gen -b master k3-image-gen
$ cd k3-image-gen && \
  git checkout ffae8800a5c81c149835ed1aa5e2fbbe65a49c0d && \
  cd ../

Fetch ti-linux-firmware:

$ cd $WORKDIR
$ git clone https://git.ti.com/git/processor-firmware/ti-linux-firmware -b master ti-linux-firmware
$ cd ti-linux-firmware && \
  git checkout 2944354aca1f95525c30d625cb17672930e72572 && \
  cd ../

Fetch arm-trusted-firmware:

$ cd $WORKDIR
$ git clone https://git.trustedfirmware.org/TF-A/trusted-firmware-a -b master trusted-firmware-a
$ cd trusted-firmware-a && \
  git checkout 2fcd408bb3a6756767a43c073c597cef06e7f2d5 && \
  cd ../

Fetch optee-os:

$ cd $WORKDIR
$ git clone https://github.com/OP-TEE/optee_os -b master optee_os
$ cd optee_os && \
  git checkout 8e74d47616a20eaa23ca692f4bbbf917a236ed94 && \
  cd ../

Build U-Boot out of Yocto tree

After fetching the source code and installing dependencies, you may return to $WORKDIR anytime and follow these steps to build U-Boot:

Setup the environment:

Export the working directory

$ export WORKDIR=~/am62x-var-som-u-boot

Export variables for building U-Boot

$ export PATH=$HOME/gcc-arm-9.2-2019.12-x86_64-arm-none-linux-gnueabihf/bin:$PATH && \
  export PATH=$HOME/gcc-arm-9.2-2019.12-x86_64-aarch64-none-linux-gnu/bin:$PATH && \
  export export TI_SECURE_DEV_PKG=$WORKDIR/core-secdev-k3 && \
  export UBOOT_DIR=$WORKDIR/ti-u-boot  && \
  export K3IG_DIR=$WORKDIR/k3-image-gen && \
  export SYSFW_DIR=$WORKDIR/ti-linux-firmware/ti-sysfw && \
  export DMFW_DIR=$WORKDIR/ti-linux-firmware/ti-dm/am62xx && \
  export TFA_DIR=$WORKDIR/trusted-firmware-a && \
  export OPTEE_DIR=$WORKDIR/optee_os

Build for GP am62 SoC:

ATF

$ cd $TFA_DIR
$ make -j$(nproc) ARCH=aarch64 CROSS_COMPILE=aarch64-none-linux-gnu- PLAT=k3 TARGET_BOARD=lite SPD=opteed

OP-TEE

$ cd $OPTEE_DIR
$ make -j$(nproc) CROSS_COMPILE64=aarch64-none-linux-gnu- CROSS_COMPILE32=arm-none-linux-gnueabihf- PLATFORM=k3-am62x CFG_ARM64_core=y

U-Boot R5 Images Optional: Modify am62x_var_som_r5_defconfig

$ cd $WORKDIR/ti-u-boot
$ make -j$(nproc) ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabihf- am62x_var_som_r5_defconfig O=$UBOOT_DIR/out/r5
$ make -j$(nproc) ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabihf- O=$UBOOT_DIR/out/r5 menuconfig
... make and save some changes ... 
$ make -j$(nproc) ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabihf- O=$UBOOT_DIR/out/r5 savedefconfig
$ cp defconfig configs/am62x_var_som_r5_defconfig

Build u-boot-spl.bin for tiboot3.bin. Saved in $UBOOT_DIR/out/r5:

$ cd $WORKDIR/ti-u-boot
$ make -j$(nproc) ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabihf- am62x_var_som_r5_defconfig O=$UBOOT_DIR/out/r5
$ make -j$(nproc) ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabihf- O=$UBOOT_DIR/out/r5

Build tiboot3-am62x-gp-evm.bin. Saved in $K3IG_DIR. Requires u-boot-spl.bin and ti-fs-firmware-am62x-gp.bin.

$ cd $K3IG_DIR
$ make -j$(nproc) ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabihf- SOC=am62x SOC_TYPE=gp SBL=$UBOOT_DIR/out/r5/spl/u-boot-spl.bin SYSFW_DIR=$SYSFW_DIR

U-Boot A53 Images

Build tispl.bin and u-boot.img. Saved in $UBOOT_DIR/out/a53. Requires bl31.bin, tee-pager_v2.bin, and ipc_echo_testb_mcu1_0_release_strip.xer5f.

$ cd $WORKDIR/ti-u-boot
$ make -j$(nproc) ARCH=arm CROSS_COMPILE=aarch64-none-linux-gnu- am62x_var_som_a53_defconfig O=$UBOOT_DIR/out/a53
$ make -j$(nproc) ARCH=arm CROSS_COMPILE=aarch64-none-linux-gnu- ATF=$TFA_DIR/build/k3/lite/release/bl31.bin TEE=$OPTEE_DIR/out/arm-plat-k3/core/tee-pager_v2.bin DM=$DMFW_DIR/ipc_echo_testb_mcu1_0_release_strip.xer5f O=$UBOOT_DIR/out/a53

Update U-Boot on running system

To update U-Boot on an existing system, the following SPL and U-Boot images need to be installed to the boot partition of the boot media (eMMC or SD):

$K3IG_DIR/tiboot3.bin
$UBOOT_DIR/out/a53/tispl.bin
$UBOOT_DIR/out/a53/u-boot.img

After updating the boot media, boot U-Boot and verify the commit ids of the R5 SPL, A53 SPL, and A53 U-Boot match the output of git rev-parse HEAD. For example:

$ cd $UBOOT_DIR && git rev-parse HEAD
aa251b91f7ff0d346db034ed6513fdaec3526871

Verify this matches the versions printed by U-Boot:

U-Boot SPL 2021.01-gaa251b91f7 (Mar 23 2023 - 22:04:15 +0000)    <--- R5
U-Boot SPL 2021.01-gaa251b91f7 (Mar 23 2023 - 22:04:15 +0000)    <--- A53
U-Boot 2021.01-gaa251b91f7 (Mar 24 2023 - 16:25:35 -0500)        <--- A53

Update U-Boot on an SD Card

To update U-Boot on an SD Card, copy the files to the sd card.

Mount the SD card boot partition on your host computer and verify the previous U-Boot files are installed:

$ mkdir ~/.sdcard
$ sudo mount /dev/sdX ~/.sdcard
$ ls ~/.sdcard
tiboot3.bin  tispl.bin  u-boot.img  uEnv.txt

Copy the new files and umount the SD card:

$ sudo cp $K3IG_DIR/tiboot3.bin $UBOOT_DIR/out/a53/tispl.bin $UBOOT_DIR/out/a53/u-boot.img ~/.sdcard
$ sudo umount ~/.sdcard && sync

Boot the SD card and verify the R5 SPL, A53 SPL, and A53 U-Boot match the output of git rev-parse HEAD

Update U-Boot using UMS

U-Boot can be updated by using the USB Mass Storage gadget to mount the eMMC or SD card on your host computer.

Connect the USB OTG port to host computer.
Start the VAR-SOM-AM62 and interrupt U-Boot
Start UMS on eMMC:

u-boot> ums 0 mmc 1

Or...start UMS on SD card:

u-boot> ums 0 mmc 2

Mount the SD card boot partition and verify the previous U-Boot files are installed:

$ mkdir ~/.sdcard
$ sudo mount /dev/sdX ~/.sdcard
$ ls ~/.sdcard
tiboot3.bin  tispl.bin  u-boot.img  uEnv.txt

Copy the new files and umount the SD card:

$ sudo cp $K3IG_DIR/tiboot3.bin $UBOOT_DIR/out/a53/tispl.bin $UBOOT_DIR/out/a53/u-boot.img ~/.sdcard
$ sudo umount ~/.sdcard && sync

Boot the SD card and verify the R5 SPL, A53 SPL, and A53 U-Boot match the output of git rev-parse HEAD

Update U-Boot using Ethernet

U-Boot can be updated on a running system by using scp to transfer the files:

Mount the eMMC boot partition and verify the previous U-Boot files are installed:

# mount /dev/mmcblk0p1 /mnt/
# ls /mnt
tiboot3.bin  tispl.bin  u-boot.img  uEnv.txt

Transfer the new files:

$ scp $K3IG_DIR/tiboot3.bin $UBOOT_DIR/out/a53/tispl.bin $UBOOT_DIR/out/a53/u-boot.img root@<ip address>:/mnt/

Reboot the VAR-SOM-AM62 and verify the R5 SPL, A53 SPL, and A53 U-Boot match the output of git rev-parse HEAD

Yocto Build U-Boot TI

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